Hello,
Can you do as the image in the attached document shows?
The house has a mansard roof and trusses as fig. 1 shows. My question is whether it's possible to do as fig. 2 shows to create space in the house. That is, to insert a wedge according to the image (green in fig. 2) and then remove parts of the truss (blue parts in fig. 1). As I understand it, the load is precisely in this area, down into the wall.
Since there is a staircase up to the second floor along one wall of the house and some solution has been made there to create space according to fig. 2, could it be that they did this at the time of building the house, or should it be done in some other way to make it acceptable without risking anything?
Thank you in advance?
Can you do as the image in the attached document shows?
The house has a mansard roof and trusses as fig. 1 shows. My question is whether it's possible to do as fig. 2 shows to create space in the house. That is, to insert a wedge according to the image (green in fig. 2) and then remove parts of the truss (blue parts in fig. 1). As I understand it, the load is precisely in this area, down into the wall.
Since there is a staircase up to the second floor along one wall of the house and some solution has been made there to create space according to fig. 2, could it be that they did this at the time of building the house, or should it be done in some other way to make it acceptable without risking anything?
Thank you in advance?
At first, I thought of keeping quiet, it's better if you get a response from someone more knowledgeable, but since no one has spoken up yet...
I'm a little skeptical.
The support leg you want to remove is primarily to prevent the truss from collapsing inward. Your wedge is supposed to do the same thing, but since it's located much lower, there will be a very long lever arm above it, so shouldn't it experience much greater forces than the support leg does?
Then you've drawn it such that the wedge is supposed to sit against the top of the wall a bit above the attic floor. Are you sure there's a load-bearing support there? It's a bit different how mansard trusses are made.
It's quite common for one or two support legs to be missing in houses like these, but then there's often some sort of compensation. In our house (from the twenties with a mansard roof), two support legs are missing due to the stairwell's placement, but instead there is an internal supporting wall parallel to the stairwell.
Just some thoughts... hope someone who really knows can comment...
I'm a little skeptical.
The support leg you want to remove is primarily to prevent the truss from collapsing inward. Your wedge is supposed to do the same thing, but since it's located much lower, there will be a very long lever arm above it, so shouldn't it experience much greater forces than the support leg does?
Then you've drawn it such that the wedge is supposed to sit against the top of the wall a bit above the attic floor. Are you sure there's a load-bearing support there? It's a bit different how mansard trusses are made.
It's quite common for one or two support legs to be missing in houses like these, but then there's often some sort of compensation. In our house (from the twenties with a mansard roof), two support legs are missing due to the stairwell's placement, but instead there is an internal supporting wall parallel to the stairwell.
Just some thoughts... hope someone who really knows can comment...
Thank you for your reply.
I have added a new image where I attempted to draw more accurately how it is constructed today; perhaps it can provide a better basis for how it is now and for advice on the matter. However, the idea of how the wedge should be placed still applies, i.e., the image in the previous post.
What I am not quite clear on regarding the moment and load during, e.g., wind, is that the part I want to remove is in the same section that holds up the roof. Thus, I have come to believe that the horizontal and short part is meant to support the roof truss on the load-bearing outer wall, and the other parts thereby provide support for it?
Furthermore, since there are beams extending from one side to the other (attic floor), these would presumably offer support for the external influences that might occur? Also, don't these have a load-bearing and relieving effect on the outer walls since they rest on the load-bearing wall in the middle of the house?
Just as you describe, it is also the case in my stairwell. I can also see that the horizontal wall there goes higher up than where the roof trusses are intact, meaning that behind the wall, there is some form of wedge or similar that extends the horizontal wall a bit upwards, similar to what would happen if I did as I intend. I don't perceive that they have added an "extra" and supporting wall.
What I've seen in another house belonging to some friends, where they have a broken roof, is that they probably don't have many of these parts left on their roof trusses that I am wondering about. I could imagine that their house might be missing maybe 4-5 of 7 roof trusses (apart from those in the gable itself), and they might have significant beam offset there?
As mentioned, I appreciate all the help and advice I can get since I feel it might not be so smart to start cutting wildly.
Thank you in advance.
I have added a new image where I attempted to draw more accurately how it is constructed today; perhaps it can provide a better basis for how it is now and for advice on the matter. However, the idea of how the wedge should be placed still applies, i.e., the image in the previous post.
What I am not quite clear on regarding the moment and load during, e.g., wind, is that the part I want to remove is in the same section that holds up the roof. Thus, I have come to believe that the horizontal and short part is meant to support the roof truss on the load-bearing outer wall, and the other parts thereby provide support for it?
Furthermore, since there are beams extending from one side to the other (attic floor), these would presumably offer support for the external influences that might occur? Also, don't these have a load-bearing and relieving effect on the outer walls since they rest on the load-bearing wall in the middle of the house?
Just as you describe, it is also the case in my stairwell. I can also see that the horizontal wall there goes higher up than where the roof trusses are intact, meaning that behind the wall, there is some form of wedge or similar that extends the horizontal wall a bit upwards, similar to what would happen if I did as I intend. I don't perceive that they have added an "extra" and supporting wall.
What I've seen in another house belonging to some friends, where they have a broken roof, is that they probably don't have many of these parts left on their roof trusses that I am wondering about. I could imagine that their house might be missing maybe 4-5 of 7 roof trusses (apart from those in the gable itself), and they might have significant beam offset there?
As mentioned, I appreciate all the help and advice I can get since I feel it might not be so smart to start cutting wildly.
Thank you in advance.
Off topic but if you upload images instead of Word documents that are blocked due to virus risk, there is probably hope for more advice.
/Kent
/Kent